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16 Qctober•1997 A <br /> A6E-NC,ProJect'No.,96-0232 <br /> Page 3 of 5 <br /> of-drUnified <br /> SoiY Classification System (USCS), and'were monitored`for fhe PYeTherma Engiranmen al <br /> ui ed with a photo ionization detector(P <br /> ID <br /> using an organic vapor meter eq .pp 1 s are summarized rn Appendix,A. <br /> 5$OA, 10..0°eV calibrated'to`isobufylene). Boring og _ <br /> 2.6, -EQUIPMENT PECONTAMIINATION y <br /> r tem,au ers vi�ere steam cleaned prior to adVanGing'each boring. All Sampling too1S'and' <br /> I, All hollows g. vas ing <br /> er hi <br /> brass sle <br /> eves used for sample collection.were thorougily,'rinsed with clean wage nae ch birig with <br /> a solution of Alconok. All Ceoprobe rods.were"cleaned prior to advaneemen P. <br /> = 3.0. FINDINGS <br /> SOIL PROFILE. e coarse. <br />�. countered at the site consisted`primarily of silt, clayey silt, fine sandy silt,.and fin to. <br /> b a vn dam fine <br /> Soil en P <br /> sand:The'following lithology was generally rade totere en feebbsg A mottled red-brown-to pale brown, <br /> sandy,-silt was encountered from surface g <br /> darn , fine to mediurn'sand was encountered at'depths`between 5 and 1.5 feet bsg. Red-brown, moist <br /> l� <br /> to saturated,•clayey silt, fine sandy silt and silty sand inteivalw Were <br /> oun eredraddepths betweeene40 <br /> 15'and'40 feet. A red-brawn; saturated, fine'to coarse sand. <br /> a' ''52 feet,bsg," 'bile a.brown, dry silt wa's encountered at,depths between.52 and 60 feet bsg. A <br /> brown, saturated, silty fine sand was encountered between 60 and b5 et A brow1n�moist, C1aYeY,to rnediL�rn a5 l <br /> aird'.silty.facie sand were encountered,at-depths between 65 and 69Y <br /> 7�.-feet bs . Boring logs are included'in Appen. ix.A. GeneraL'litliolo beneath' <br /> was encountered at <br /> the site:in cross sectional view is depicted on;Figure Nos. 3 and,4 - Gea7ag'cal.Grass Section A =A ' <br /> and Geological Crass-Section B <br /> FIELD EVIDENCE.(JF I iYDROCARB <br /> ON-IMPACTED SOIL. AND GROUND WATER' . <br /> m hydrocarbon odor Was not detected;frgrn any samples collected from borings P. l through <br /> Petroleu y _ <br /> P-5 however,' petro�e m hydrocarbon vapor was detecfeo from soil boring -1 ant concentrations as . <br /> high as'45 parts per minion (ppm), and_frarri P�2 at concentrations up to pp <br /> Advanced GeoEnt'lron;t3eYstal,Inc. <br />